Analysis of onset and cessation of rainfall in southwest nigeria: food security impact of of variability in the length of growing season

Sobowale, A.; Sajo, S. O.; Ayodele, O. E.

doi:10.17676/hae.2016.30.23

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…This is similar to studies conducted in West Africa by Laux et al. (2009) ; Odenkunle (2004) ; Sobowale et al. (2016) .…”

Section: Resultssupporting

confidence: 92%

“…And, the farmers reported shift in the onset and that it was becoming unpredictable, highlighting the occurrence dry spell after planting. This is similar to studies conducted in West Africa by Laux et al (2009); Odenkunle (2004); Sobowale et al (2016). Rainfall variability has a direct impact on crop productivity.…”

Section: Areas At Risk Of a Dry Spell At The Beginning Of The Growing Seasonsupporting

confidence: 91%

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Investigating false start of the main growing season: A case of Uganda in East Africa

Ocen

Bie

Onyutha

2021

Heliyon

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False start of the growing season (Fsos) is a component of the onset variability related to agronomic drought that adversely impact on agricultural production and productivity. In the sub-Saharan Africa (SSA) where agriculture heavily depends on rainfall, the Fsos tends to create confusion among farmers on when to start planting crops thereby affecting seed germination and normal growth after emergence. In this paper, we focus on the Fsos and the occurrence of dry spell especially before the Start of growing Season (SoS). We take advantage of the existing rainfall estimates (CHIRPS) and remotely sensed data for vegetation performance (NDVI) over the period 1999–2017 in combination with local knowledge derived from farmers to map out areas at risk of (i) dry spell at the SoS, and (ii) false timing of SoS or high probability of occurrence of the Fsos. We found that the North Eastern part of Uganda (8.8% of arable area) were at risk of dry spell throughout each year. However, the greater North (58.1% of arable area) was prone to dry spell during the onset of the March–May season. Areas in the South Western (3.7%) region were at risk during the onset of the September–November season. The probability that a location in Uganda experiences an Fsos falls between 0-53%. The findings in this study are vital for planning of predictive adaptation to the impacts of climate variability on agriculture amid struggle aimed at tackling food insecurity challenge in the SSA.

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“…This is similar to studies conducted in West Africa by Laux et al. (2009) ; Odenkunle (2004) ; Sobowale et al. (2016) .…”

Section: Resultssupporting

confidence: 92%

Section: Areas At Risk Of a Dry Spell At The Beginning Of The Growing Seasonsupporting

confidence: 91%

Investigating false start of the main growing season: A case of Uganda in East Africa

Ocen

Bie

Onyutha

2021

Heliyon

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“…The SWN is geographically located between longitude 8°E and latitude 10°N with a total land area of about 77,818 km 2 and comprise of six states namely Ekiti, Lagos, Ogun, Osun, Oyo and Ondo (Ajayeoba, Atanda, Obadina, Bankole, & Adelowo, 2016;Faleyimu, Agbeja, & Akinyemi, 2010;Sobowale, Sajo, & Ayodele, 2016). The annual rainfall (ca.…”

Section: Study Areamentioning

confidence: 99%

Diversity and distribution patterns of aquatic macrophytes in selected ecosystems of south western Nigeria

2020

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The present study investigates the macrophytes diversity from selected aquatic ecosystems in South‐Western Nigeria using quadrat method. The survey revealed two major aquatic ecosystem types (mangrove and freshwater swamp) and recorded a total of 83 species belonging to 77 genera and 41 families. Three species (Sacciolepis africana, Ipomoea asarifolia and Commelina diffusa) were found present in all the surveyed areas. However, species such as Acrostichum aureum, Avicennia germinans and Rhizophora racemosa were restricted in its distribution. Poaceae and Ludwigia were the dominant family and genus, respectively. In addition, our study recorded Hallea ledermannii classified as vulnerable by IUCN Red List. Diversity analysis revealed high species richness in all the studied locations especially in Lagos State. Similar diversity pattern was observed for Osun and Oyo States. Further, our results reflect that macrophytes assemblages in South‐Western Nigeria could be influenced by human activities. Hence, we recommend further studies that would test hypothesis on how human activities affect the diversity and distribution of flora in the area. Additionally, conservation of the aquatic environments of the region appears necessary. The findings of this study provide insights on the patterns of macrophyte diversity in South‐Western Nigeria, thus, forms a guideline for initiating effective conservation policies in the area.

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“…For instance, the negative trend recorded in the months of December and February, which are part of dry season in the study area, revealed that dry season farming can only thrive if only water supply for plants can be augmented from other sources. Even though, the results showed that more water was received in November which marks the commencement of dry season in the study area, and also more rain in January, the intense heat often characterized the period has the tendency to aggravate evapotranspiration which could hinder water availability for good plant growth in the period, thus, the need for water supply augmentation earlier mentioned (Atedhor, 2016;Sobowale et al, 2016;Eruola, et al, 2021). Water supply augmentation may include artificial water supply to enhance plant growth as also supported by Sobowale et al, 2016).…”

Section: -Year Trend Of Rainfall By Months: Figures 3(i-xii)mentioning

confidence: 78%

Rainfall trend and its Implications for Sustainable Crop Production and Water Resources Management: A Case Study of Iwo, Nigeria

Ogunbode¹,

Esan²,

Samson³

et al. 2022

jasem

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Studies have revealed that the pattern of rainfall will change in view of climate change scenario being experienced globally. Thus, a thirty-year (1989-2018) rainfall data analysis was conducted for Iwo in Osun State, southwestern Nigeria to determine the trend pattern of rainfall. One parameter Mann-Kendall statistic was used in the analysis of the data. The results showed that while five months (February, April, July, August and December) showed negative trend (Negative y-values) indicating declining rainfall over the period, seven months (January, March, May, June, September, October and November) revealed a positive trend (positive y-values) implying increasing rainfall over the period for those months. However, the general analysis of the 30-year data showed that there was negative trend in rainfall in the study area which means that there is general fall in the rainfall incidence over the period in Iwo. The results of monthly trend indicated that rainfall is no longer dependable for a viable agricultural practice, and so water conservation methodologies need to be embarked upon in order to salvage crops from the shortfall in the rain caused by climate change. It is therefore, recommended that shifting in the planting dates, irrigation, planting cover crops and planting heat tolerant crops and early matured crop varieties among others should be considered by farmers, especially the small scale farmers. Stakeholders in water resources management holds the responsibility on averting water scarcity and the challenge of water pollution in view of the erratic rainfall to ensure human survival.

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Analysis of onset and cessation of rainfall in southwest nigeria: food security impact of of variability in the length of growing season

Cited by 6 publications

References 12 publications

Investigating false start of the main growing season: A case of Uganda in East Africa

Investigating false start of the main growing season: A case of Uganda in East Africa

Diversity and distribution patterns of aquatic macrophytes in selected ecosystems of south western Nigeria

Rainfall trend and its Implications for Sustainable Crop Production and Water Resources Management: A Case Study of Iwo, Nigeria

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